It took place earlier this year at Wimbledon, where for two and a half sets it looked like Keys, swinging away with willful abandon from the baseline, would overwhelm the No.4 seed. It was not to be, as Radwanska hung onto Keys' coattails before edging over the line.
The two met again on Wednesday at the China Open, and despite a one-sided scoreline, Keys impressed once again in defeat.
In January, Li Na earmarked the young American as the one to watch from the emerging crop of talented youngsters on tour, and Radwanska has been quick echo this sentiment. "Earlier this year, a journalist asked me to name one of the young players to look for and having some good results. Even then, I picked her," Radwanska said. "I think she's a very good up-and-coming player. She can really do well. If she's going to work hard and keep playing like this, we are going to see her much often."
In Beijing, Radwanska managed to negate the 18-year-old's much-vaunted serve and forehand with a mixture of discipline and some power of her own.
"I definitely remember that match from Wimbledon - a very tight three set match - and I knew I would have to play great tennis to beat her today," Radwanska said after her 63 62 victory. "I was playing very well right from the beginning and I'm just very happy that I could win this match in two sets."
The familiarity with Keys' game from their All-England Club epic also allowed Radwanska to draw up the blueprint for the rematch. "It's always a bit easier to play someone that you know. She's got a big serve and a big forehand, so I knew I'd have to be careful with those shots and knew that I'd have to give her a lot of deep balls.
"She's a very aggressive player so I knew I'd have to stay as close to the baseline as possible - it was hard sometimes but I like to run so it wasn't a problem!"